Feed-regulator for powdered coal



H. THOMAS AND DAHLSTROM.

FEED REGULATOR FOR POWDERED COAL.

APPLICATION FILED SEPT. 12. 1919.

1,388,129. Patented-Aug.16,1921-.

FIG-.1 2. 4

' J .g i l I l n 2% .ii i I g I I I I i :1 5' :i- 1 22 H J A1- 44-1INVENTM UNITED ST T S PATENT oFFicE.

FEED-REGULATOR FOR POWDERED GOAL.

Specification of Letters Patent. Pjggnfgd ytggg, is 1921,

Application filed September 12, 1919; Serial No. 323,381.

T 0 all whom it may concern.

Be it known that we, HANSON THOMAS and J OI-IN DAHLSTROM, citizens ofthe United States, residents of Pittsburgh, in the county of Alleghenyand State of Pennsylvania, have invented a new and useful Improvement inFeed Regulators for Powdered Coal; and we do hereby declare thefollowing to be a full, clear, and exact description thereof.

Our invention relates to a feed regulator for powdered fuel.

In Letters Patent of the United States No. 1,304,407, granted to us onthe 20th of May, 1919, we have set forth and claimed a certainimprovement in feed regulators for powderedfuel in which a deflectingmember is located at the discharge opening of a supply pipe forconveying the air and powdered fuel in the path of said air and fuel,said deflecting member being movable to and from said opening, whereby aportion of the air and fuel in its passage through said supply pipe isdischarged through said opening. While the invention of the above patenthas many advantages over anything in the prior art, yet it has beenfound in practice that the powdered fuel collects around the stem of thedeflecting member which passes down through the connection leading fromthe opening in the supply pipe to the pipe leading to the furnace, andclogs up the opening through which said stem passes, whereby it is adiflicult matter and sometimes practically impossible to raise and lowerthe deflecting member, Powdered fuel which is reduced to a very finestate will find its way into and around the closest joints and builds upor cakes at such points which causes the difiiculty above referred to.

The object of our present invention is to provide against this stickingof the stem for operating the deflecting member due to 1ts becomingclogged up by the pulverized fuel, and to these ends our inventioncomprises the novel features hereinafter set forth and claimed.

In the accompanying drawing Figure 1 is a longitudinal section of aportion of a supply pipe for conveying the combine-d and pulverizedfuel, showing our invention applied thereto, and Fig. 2 is a crosssection of same.

In the accompanying drawing the numeral 2 designates a suitable mainsupply pipe or branch from the main supply pipe for conveying thepowdered fuel under blast to the furnaces. We have only shown oneconnection from this pipev to the furnace, although it is apparent thatbranch pipes are to be attached at different points accord ing to thenumber of furnaces to be supplied therefrom.

A saddle 3 is secured in position by the U-bolts 4 and nuts 5. Securedto the saddle 3 is the elbow-casting 6 with the passage 7 formedtherein. This casting 6 has the flange 8 and said casting is secured tothe saddle 8 by the threaded bolts 9 screwed'into said saddle andprovided at their outer ends with the nuts 10. By this construction thecasting 6 andrthe bars carried thereby may 7 be readily detached'fromthe supply pipe for repair purposes.

The neck-portion 11 of the casting 6 projects up into the pipe 2 throughthe opening 12 formed therein. The saddle 3 has also the neck-portion 13projecting up into the pipe 2, and the neck 11 of the casting 6 fitswithin the neck-portion of Said saddle.

The casting '6 has the opening 14 formed therein to receive the stem 15.The opening 14 is formed in the inclined portion 14 of the casting 6 sothat when the stem 15 is turned in said opening 14 said stem will bewiped for a distance between the points a and 2), due to itspassingthrough the opening 14: formed in the inclined portion 14*, as will bemore fully hereinafter described.

The stem 15 has the threaded portion '16 which engages the threaded seat17 in the bracket 18 of the casting G. The lower end of the stem 15 isprovided with the head 19 with an opening 19 for the reception of a barfor turning the stem 15.

The inner end of the stem 15 carries the deflector or discharge member20, said member consisting of an inverted cone.

When our improved regulator is-in use and the powdered fuel is to bedelivered to the furnace through the pipe 26, the deflector 20 projectswithin the pipe 2 as indicated in Fig. 1, and'the combined air and coaltraveling in the direction of the arrow will be caught or deflected bythe deflector 20 and discharged down into the passage 7 and thence bythe pipe 26 to the furnace. By turning the stem 15 the position of thedeflector may be regulated so as to increase or decrease the amount offuel delivered to the furnace, it being apparent that by withdrawing thedeflector the area exposedrto the oncoming fuel is reduced andconsequently the amount of coal delivered to the furnace is reduced.WVhere it is desired to cut off the supply entirely the stem 15 isturned until the deflector 20 is withdrawn to the position indicated indotted lines Fig. 1, and is seated on the neck portionll of the casting6. In this position of the deflector the supply of fuel to the pipe 26is completely shut off. As the deflector is turned when seated it willbe apparent that due to the conical form of the deflector the seat aswell as the deflector will be wiped clean so as to remove any fuel dustwhich has collected around the seat.

The turning of the stem 15 working in the opening 14 in the inclinedportion 1 of the casting 6 will act to wipe and clean the stem so as toprevent the sticking of the stem due to the clogging or calring of thepulverized fuel around the stem. This construction always insures theproper move ment of the stem, and consequently the accurate adjustmentof the deflector 20.

What we claim is:

In a feed regulator for powdered fuel, the combination of a supply pipefor conveying the air and powdered fuel, having a discharge outlet, aconnection leading from said outlet having an opening formed therein,with inner and outer inclined faces surrounding said opening, a rotarystem carried by said connection and passing through said opening, and adeflecting member carried by said stem adapted to be projected into thepath of the air and powdered fuel, or withdrawn therefrom whereby a'portion of the air and powdered fuel in its passage through said pipeis discharged through said discharge opening.

In testimony whereof, we the said HAN- SON THOMAS and Join": DAHLSTROM,have hereunto set our hands.

HANSON THOMAS. JOHN DAHLSTROM. Witnesses:

Rom. D. TOTTEN, JoHN F. WVILL.

